[Lcms-user] Are transforms thread safe?

[David K. <kan...@di...>]

Hi!

I'm trying out LCMS2 for a project. So far it's working nicely but I'd
like to speed up the application of a transform. My question is this:
Is it safe to create a single transform on the main thread and apply
it (via DoTransform) on multiple threads running concurrently? I'm
creating the transform with CreateMultiprofileTransform.

If so, are there any settings I must use, such as #defines, to make
the operation thread-safe?

If that cannot be done, and I have to have separate transforms for
each thread, what about the creation of the transforms? Can I do that
concurrently on separate threads, or is CreateMultiprofileTransform
also not thread-safe? If it is thread-safe, is there a performance
gain from doing so, or am I better off creating them sequentially on
one thread?

Finally, if there is the ability to create the transforms
concurrently, do they _have_ to be created on the threads that use
them? And is there an advantage to setting a core affinity for each
one, or does that not matter?

Thanks in advance.